Precautions for purchasing refurbished motorcycles: carefully check the vehicle to see if the engine and gearbox have been turned on, and whether there is oil leakage in the front and rear shock absorbers. If it is a chain-driven vehicle, check whether the chain and large and small toothed discs are excessively worn; Ladies' cars should check whether the drive belt is aging and the clutch is excessively worn. Start the vehicle for trial operation, check the cold start and hot start of the vehicle, and listen carefully to the sound of the valve and exhaust pipe. During the road test, check the braking situation, and see if there is any phenomenon such as shaking, tail flick and jumping when the vehicle is driving. Finally, check whether there is any lubricating oil leakage.